Machine for crushing or grinding



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Apr 10, 1923 HHM WITNESSESQ Apl. 10, 1923. 1,451,150

f G. H. FRASER MACHINE FOR CRUSHING 0R GRINDING original Filed' Jan. 51,1917 I 2 sheets-heet 2 INVENTOR Patented Apr. l, 1923.

rarest ortica.

GEORGE H. FRASER, OF BROOKLYN, NEW YORK.

MACHINE FOR CRUSHING OB, GRINDING.

Original application led March 16, 1905, Serial No. 250,474. Divided andthis application filed January 31, 1917, Serial No. 145,690.

To all whom t may concern Be it known that l, Grenen H. llimsnn, acitizen of the United States, residing in the borough of Brooklyn,county of Kings, city and State of New York, have invented certain newand useful Improvements in Machines for Crushing or Grinding, being adivision of my application led March 16th, 1905, Serial Number 250,474,renewed July 3, 1916, renewal Serial No. 107,467, patented April 10,1917, No.`1,222,382, of which the following is a specification.

This invention relates to machinery for crushing, grinding orpulverizing materials, and aims to provide certain improvements therein.

The invention relates more particularly to rock Crushers of the typehaving a plurality of crushing rolls within an annulardie in which thecrushing is effected between the periphery of the rolls and the innerface of the die. One example of this type of Crusher is shown in thepatent of H. L. Kent, granted May 7, 1901, No. 673,856, in which the dierevolves and is held in position by the rolls, which latter are carriedby shafts held in bearings at the outside of the casing, the bearingsbeing carried by slideways and pressed outwardly by springs, so that therolls may slide in and out radially of the ring. The top roll in thispatent is shown as supporting the ring yieldingly, and the slidingframes carrying the shafts are of sectional construction, and both guidethe shafts and transmit the crushing pressure from the springs to them.

My present invention aims to provide an improved Crusher or pulverizerespecially applicable to this general type.

To this end in carrying out my present invention in its preferred form,I provide an improved arrangement of die and rolls, improved means forcarrying the roll shafts, improved means for guiding such shafts, meansfor transmitting all or part of the crushing thrust from one roll toanother in whole or in part, and various details of improvement in theconstruction and arrangement of the various parts of the Crusher, all ofwhich will be hereinafter more fully set forth with reference to theaccompanying drawings, in which Fig. 1 is a fragmentary side elevationof a pulverizer embodying the preferred form of my invention, the viewbeing partly broken away to show two of Renewed December 15. 1922.

the yokes in mid-section, and Fig. 2 is a rear elevation partly invertical axial mid-section.

Referring to the drawinofs, A is the casing, B is the ring or die, C, 1and C2 are the crushing rolls, D, D1 and D2 are their shafts, E, El andE2 are their bearings, S, S1 and S2 are the crushing springs, and d, d1and Z2 are adjusting screws. 1 l

The casing encloses the ring and rolls and supports them. The top rollin the construction shown carries the ring by acting against the innerface, and the other rolls press out,-

wardly against the inner face to Crush the rock between theirperipheries and suchi face. Their pressure may be adjustedby the springsand adjusting screws. The ring and rolls are driven in any suitablemanner, as by driving the shaft D by the pulley F for example. The feeddelivers the rock on to the inner face of the ring, and the crushed rockflows ofl3 the sides of the ring and falls out through an opening j inthe bottom of the casing. The casing is made sectional to permitopening, as by being constructed as a base or bottom shell a and a coveror top shell I will now describe in detail the preferred form of myimprovements as illustrated in the drawings. i .f

According to one feature of improvement, l preferably guide the bearingsforI the several shafts'by a swinging guide or pivotal connection, sothat e-achcan oscillate relatively to a predetermined axis if itsmovement radially of the ring is necessary. pre-fer to so guide eachshaft bearing, and to carry all from the casing, which for this purposeI preferably provide with a transverse shaft ,f/, the shaft g beingconnected to the top` bea-ring by links r4 on opposite sides of thecasing, and the bearing E being connected by links s4 to the lowerbearings El and E2, so that each of these lower bearings is yieldinglyor movably sustained or supported pivotally from its center from thebearing E. These connections permit the bearings to rock toward and fromthe center of the ring, but support them against thrusts in thedirection of drive of the ring, as well as in case of the lower bearingscarrying part of their weight. The links are connected to the respectivebearings by pins ey traversing the ends of the links and holes inprojections f on the bearings. The links 14 lll) may be looselyconnected to the shaft g, so that they can rock independently of eachother. This construct-ion attains a more advantageous guidance .of theroll shafts than heretofore, and provides a much simpler and moreeconomical means for correctly guiding them.

According to another feature of improvement, l provide a rigid bearing`frame preferably consisting of aI single U-shaped casting or yoke e'straddling 'the casing and receiving the ends of the shaft' at oppositesides thereof, so that these ends are assured of parallel bearings, andthe nlunber of parts necessary is reduced to the minimum. The bearingend of each yoke is plancd and covered by a bearing cap 7J, and theprojections f for the supporting links are preferably cast integral withthe cap so as to support, guide or sustain the bearing from the cap.Each yoke is a relatively heavy casting in order to give not only thestrength necesp sary to rigidity, but the weight desirable to thenecessary crushing pressure or inertia. Each yoke is preferably formedwith a Spring pocket Z for receiving the pressure spring, landhas ascrew threaded aperture m for the corresponding adjusting screw'. Thespring pocket is formed in a central enlargement a on the outer side ofthe yoke, which is connected by a rib o and side flanges 7) withthebearing end j. The side flanges or legs ofthe yoke preferably convergetoward the center as seen in the drawing.

According to another feature of improvement I preferably mount the topshaft so that it can have a downward yield and so it ca'n be adjustedvertically, and so it can move upwardly in case of abnormal stress. Thisis preferably accomplished by mounting theyoke of the top shaft bearingon the spring S seated on the upper part of the casing and reactingthrough aseat /v against the adjusting screw Z ofthe yoke and therebysupporting'the latter from the casing at the desired vertical positionrelatively to the latter'. This provision is sufficient to keep the yokein its normal position except under exceptionalV shock or strain, when.it may move momentarily to avoid breakage.`

To reta-in the top yoke against falling sidewise,-I prefer to provide aguide carried yieldingly by the'casing as the upwardly projecting guides. These guides loosely receive the yoke near its center and limit itsmotion in forward or rearward direction. For adjusting it vertically, Iprefer to use an adjusting screw al screwing intov its spring'pocket Z,which screw may be adjusted directly or through suitable intermediateprovisions to lift the yoke more or less from the top casing. As shown,the casing is provided.V with a project-ion t, which is cylindrical andhas a concave end spaced-apart from the washer o against which latterthe screw with similar washers which are used between the adjustingscrew and spring for each of the lower yokes.

Another feature of improvement consists in utilizing the weight of thelower yokes as an auxiliary means of generating crushingl pressure. ThisI preferably accon'iplishl by utilizing the angularity of the lowerbearings so that the wei ghtcarried by them tends to force the rollsoutwardly against the inner face of the ring preferably by supportingthe outer ends of the lower bearings by pivotal connections so disposedthat the tendency of these ends vto fall under'their weight is resistedby the pivotal support in such way as to use the latter in the nature ofa toggle joint. As shown, this is done by supporting the outer end ofeach lower yoke by a link H, which is fulcrumed to the lower casing at land at the yoke at J, so ythat it movably supports this end of they yokefroml the casing, and tends to move the end of the yoke outwardly as theoutward end of the link is depressed. To carry the link H, the yoke isformed with ears w between which the link is pivoted, and the base isformed with ears between which the linkV is pivoted.

ln machines of this character the crushing pressure has been carried onthe bearings. 'When .the machine is empty, the rolls run directlyagainst the face ofthe ring, but when material is fed on to the innerface the rolls are more or less separated from this face by thethickness ofthe layer of material being crushed which rests on the face.The greater this thickness the greatenthe crushing pressure to beresisted by the bearings. My invention provides means for transmittingthe resistance of the work being done by one roll on to one or both ofthe bearings of the other rolls as a crushing force. I prefer to do thisby interposing between the bearings of the rolls or apart carrying them,an intermediate movable or yielding thrust or compression member as thelink 84 through which the stress of crushing rolls may intermittentlyAor continuously be transmitted'from one bearing to, and be resisted by,the other or others.r While the intermediate member may be utilized inany manner for any two or all the other rolls, I prefer to make it amovable link as shown', carrying it from the cap of the'top roll C tothe cap of the lower rolls respectively so that it is normally in suchposition that it will support these and will sustain these 1n caseeither moves back a predetermined distance. In such case theintermediate member will be poised between the bearings so as todistribute to each an equal pressure, transmitting the thrust of one tothe others. The intermediate link is carried at its upper end in hingedbearings or otherwise freely mounted so that it can adapt itself tovariations in the relative positions of the crushing rolls, and thuscompensate for the lack oe uniformity in their relative movement. It maybe any member of suitable properties to properly coact with the bearingportion of any two rolls, or their shafts, with which it co-acts. Ikprefer to form Iit as a link hinged to the top bearing and extendingtoward the other so that it may yield more or less if desirable. Thisintermediate thrust member makes it possible to so construct the machinethat some of the crushing strains are consumed within the .ring androlls. It greatly reduces outside strains and where desired enables theelimination of independent crushing pressure suoli as that generated bysprings and weights.

In operation the ring and rolls will be driven to make the side of thering near the feed end of the casing move in a downward direction, andat sufficient speed to cause the material to be crushed to be held onthe inner face of the ring by centrifugal force. The feed will enterthrough the chutes, fall on to the inner face of the ring, and becrushed as it passes the rolls. The speed of feed will be adj usted toapproximately maintain a predetermined depth of material on the innerface of the ring.

It will be seen that my invention provides improvements which can bevariously and advantageously availed of, and it will be understood thatthe invention is not limited to the particular combination of featuresand details of construction or arrangement herein described asconstituting its preferred form, but that it can be employed in whole orin part according to such modifications as circumstances or the judgmentof those skilled in the art may dictate, without departing from thespirit of the invention.-

What I claim is l. In combination, an annular crushing die revolving inan approximately vertical plane and having an internal crushing face, amovable and rotatable crushing roll disposed within the upper part ofand eccentric of said die and having a peripheral crushingfacereciprocal to the internal face of said die, means for revolving one ofsaid parts, movable non-rotative means on which said roll is rotatablymounted, upper roll movable upholding means disposed below the axis ofsaid roll and opposite and beneath said non-rotative means and acting onthe latter to hold said roll upwardly toward the' inner face of said dieto resist a crushing pressure from the latter, and nonrotativesupporting means for sustaining said upholding means and from which saidupholding means are movably supported.

2. In combination, an annular crushing die revolving in an approximatelyvertical plane and having an internal crushing face, a movable androtatable crushing roll disposed within the upper part of and eccentricof said die and having a peripheral crushing face reciprocal to theinternal face of said die, means for revolving one of saidi parts,movable non-rotative means at each side of said die on which said rollis rotatably mounted, movable upper roll upholding means at each side ofsaid die disposed below the axis of said roll and opposite and beneathsaid non-rotative means respectively and acting against the latterrespectively to hold said roll upwardly toward the inner face of saiddie to resist a crushing pressure from the latter, and non-rotativesupporting means for sustaining said upholding means and from which saidupholding means are movably supported.

3. In combination, an annular crushing die revolving in an approximatelyvertical plane and havingan internal crushing face, a movable androtatable crushing roll disposed within the upper part of and eccentricof said die and having a peripheral crushing face reciprocal to theinternal face of said die, means for revolving one of said parts,movable nonrotative means on which said roll is rotatably mounted, upperroll pressing means disposed below the axis .of said roll and oppositeand beneath said non-rotative means and `acting on the latter to presssaid roll upwardly toward the inner face of said die to resist acrushing pressure from the latter, and non-rotative sustaining means forsaid pressing means and on which said pressing means are sustained.

,4. In combination, an annular crushing die revolving in anapproximately vertical plane and having an internal crushing face, amovable and rotatable crushing roll disposed within the upper part ofand eccentric of said die and having a peripheral crushing facereciprocal to the internal face of said die, means for revolving one ofsaid parts, movable non-rotative means at each side of said die on whichroll is rotatably mounted, upper roll pressing means at each side ofsaid die disposed below the axis of said roll and opposite and beneathsaid `non-rotative means respectively and acting on the latterrespectively to press said roll upwardly toward the inner face of saiddie to resist a crushing pressure from the latter, and nonrotativesustaining means for sustaining said pressing means and on which saidpressing means are sustained.

5. In combination, an annular crushing die revolving in an approximatelyvertical plane and having an internal crushing face, a movable androtatable crushing roll disposed within the upper part of and eccentricof saiddie and having a peripheral crushing face reciprocal to theinternalface ofsaid die, means for revolving one of said parts, movablenon-rotative ymeans on whichroll is rotatably mounted, movable upper'roll holding means disposed below thefaxis of said roll and above theaxis of said die and opposite and beneath said nonrotative means andacting through the latter to hold said 'roll upwardly toward the innerface olisai-d die to resist a crushing pressure from the latter, andnon-rotative sustaining means sustaining said holding means and on whichsaid holding means( are sustained.

6. ln combination, an annular crushing die revolving in an approximatelyvertical plane and having ali-internal crushing face, a movable androtatable crushing roll disposed'within the upper partof and eccentricot said die and having a peripheral crushing face reciprocal to theinternal Jface of said die, means for revolving one of said'parts,movable non-rotative means at each side of said die on which said rollis rotatably mounted, movable upper roll holding means at each side ofsaid die disposed below the axis of saidroll and above the axisk of saiddie and opposite and beneath said non-rotative means respectively andacting through the latter respectively to hold said roll up# wardlytoward the inner face of saiddie to resist a crushing pressure from thelatter, and `non-rotative sustaining means sustainingl said holdingmeans and on which said holdingmeans are sustained.f

7. In combination, an annular erin-:hina die revolving in anyapproximately vertical plane and having aninternal crushinp` face,amovable and rotatable crushing roll disposed within the upper part otand eccentric ol said die and having peripheral crushing facereciprocal'to the internal Jface of said die, means for revolving one ofsaid parts, movable non-rotative means on which said roll is rotatablymounted,r upper roll yieldingTImea-ns disposed below the axis of saidroll ,andabove the axis ot said die and opposite andbeneath saidnon-rotative means and acting through the latter to hold said rollupwardly toward the inner face of said die to resist a crushing pressurefrom the latter, and non-rotative sustaining means sustaining saidyielding means andy on which said yielding means are sustained.

8. ln combination, an annular crushing diel revolving in anapproximately vertical plane and having an internal crushing Jface, amovable and rotatablecrushing roll disposed within the upper part. ofand eccentric ot said die and having ay peripheral crushing facereciprocal to the internal face et said die, means ttor revolving one etsaid parts, movable non-rotative meansat each Y sidel ol said die onwhich said roll is rotatably mounted`r upper roll yielding means at eachside of said die disposed below the axis or said roll and below the axisof said die 'and opposite and beneath said non-rotative meansrespectively and actingl through the latter respectively to hold saidroll upwardly toward the inner face of said die to resist a crushingpressure-"trom the latter, and non-rotative sustaining meanssustainingsaid yielding means and on which said yielding means are sustained.

9. ln combination, an annular crushing die 'revolving in anapproximately vertical. plane and having an internal crushing face, amovable and rotatable crushing roll disposed wit-hin the upper part ofand eccentric of said die and having a peripheral crushing facereciprocal to the internal lacc of said die, means for revolving one otsaid parts, movable non-rotative on which said roll is rotatablymounted, upper roll pivotal pressing means disposed below the axis o'l?said roll and above the axis ot said die and opposite beneath said`non-rotative means and acting through the latter to press said rollupwardly toward the inner tace ot said die to resist a. crushingpressure from the latter,`and non-rotative sustaining means sustainingsaid pivotal means and on which said pivotal means are pivotallysustained.

10. In combination, an annular crushing die revolving in anapproximately vertical plane and having an internal crushing face, amovable and rotatablel crushing roll disposed within the upper part ofand eccentric ot said die and having a peripheral crushing facereciprocal to the internal face of said die, meansv for revolving one olsaid parts, movable non-rotativel means at each side of said die onwhich said roll is rotatably mounted, pivotal upper roll pressing` meansat each side of said die disposed below the axis of said roll andopposite and beneath said non-rotative means respectively and actingthrough the latter respectively to press said roll upwardly toward theinner face of said die 'to resist a crushing pressure Afrom the latter,and non-rotatve sustaining means sustaining saidl pivotal. means and onwhich said pivotal means are pivotally sustained.

1l. In combination, an annular crushing die' revolving in anapproximately vertical plane and having an internal crushing tace, amovable and rotatable crushing rolldisposed within the upper part of andeccentric of said die and having a peripheral crushing tace reciprocalto the internal tace of said die, means for revolving one of said parts,movable non-rotative means on'which said roll is rotatably mounted,upper roll n'iovable compression means disposed below the 'axis of saidroll and above the axis of said die and opposite and beneath saidnonrotative means and acting through the latter to hold said rollupwardly toward the inner face of said die to resist a crushing pressurefrom the latter. and non-rotative sustaining means sustaining saidcompression means and on which said compression means are sustained.

12. In combination, an annular crushing die revolving in anapproximately vertical plane and having` an internal crushing face, amovable and rotatable crushing roll disposed within the upper part ofand eccentric of said die and having a peripheral crushing facereciprocal to the internal face or said die, means for revolving one ofsaid parts, movable non-rotative means at each side of said die on whichsaid roll is rotatably mounted, upper roll Amovable compression means ateach side of said die disposed below the axis of said roll and above theaxis of said die andopposite and beneath said nonrotative meansrespectively and acting through the latter respectively to hold saidroll upwardly toward the inner Jface of said die to resist a crushingpressure 'from the latter, and non-rotative sustaining means sustainingsaid compression means and on which said compression means aresustained.

13. In combination,` an annular crushing die revolving `in anapproximately vertical plane and having an internal crushing face, amovable and-rotatable crushing roll disposed within the upper part ofand eccentric of said die and having a peripheral crushingface-reciprocal to the internal face of said die, means for revolvingone of said parts, movable non-rotative means on which. said roll isrotatably mounted, a pivotal thrust member disposed below the axis ofsaid roll and above the axis of said die and opposite and beneath saidnon-rotative means and acting through the latter to hold said rollupwardly toward the inner face of said die to resist a crushing pressurefrom the latter, and non-rotative sustaining means -sustaining saidthrust member and on which said thrust member is pivotally sustained.

14. In combination, an annular crushing die revolving in anapproximately vertical plane and having an internal crushing face, amovable and rotatable crushing roll disposed within the upper part ofand eccentric of said die and having a peripheral crushing facereciprocal to the internal face of said die, means for revolving one ofsaid parts7 movable non-rotative means at each side of said die on whichsaid roll is rotatably mounted, a pivotal thrust member at each side ofsaid diedisposed below the axis of said roll andabove the axis of saiddie and opposite and beneath said non-rotative means respectively andacting through the latter respectively to hold said roll upwardly towardthe inner face of said die to resist a crushing pressure Yfrom thelatter, and nonrotative sustaining means sustaining ysaid thrust membersand on which said thru1 members are pivotally sustained.

15. In combination, an annular crushing die revolving in anapproximately vertical plane and having an internal crushing face,

a movable and rotatable crushing roll disposed within the upper parto'l'f'and eccentric or said die and .having a peripheral crushing i'acereciprocal to the internal face of said die, means for revolving one ofsaid parts, movable non-rotative means on which said roll isrotatablymounted, and upper roll rocking holding means below the axis of 'saidroll and opposite and beneath said nonvolving one of lsaid parts,obliquely downwardly movable non-rotative means on which said roll isrotatably mounted, downwardly lower roll pressing means disposed abovethe axis of said roll andl mounted opiposite and above said non-rotativemeans and acting through the latter to press said roll obliquelydownwardly and outwardly toward the inner 'face ot said die to resist acrushing pressure from the latter, and movable non-rotative means forsupporting said pressing means.

17. ln combination, an annularcrushing die revolving in an approximatelyvertical plane and having an internal crushing face, a rotatable andobliquely downwardly and outwardly movable crushing roll disposed withinthe lower part of and eccentric of said die and having a peripheralcrushing 'face reciprocal to the internal face or' said die, means forrevolving one of said parts, obliquely downwardly and outwardly movablenon-rotative means at each side of said die on which said roll isrotatably mounted, movable lower roll holding means at each side of saiddie disposed above the axis of said roll and mounted opposite and abovesaid non-rotative means respectively andacting through the latterrespectively to hold said roll obliquely downwardly and outwardly towardthe inner face of said die to resist a crushing pressure from thelatter, and movable non-rotative means for supportin said pressingmeans.

18. n combination, an annularl crushing die Vrevolving in anapproximately vertical plane and having an internal crushing'face,amovable and rotatable crushing roll within and eccentric of said dieand having a peripheral crushing face reciprocal to the internal face ofsaid die, means for revolving one of said parts, movable non-rotativemeans .on which said roll is rotatably mounted,

lil() pressing Ymeans disposed inwardly of the axis of saidroll andinwardly of and opposite said non-rotative means and mounted above theaxis of said die acting through said non-rotat-ive means for pressingsaid roll outwardly toward the inner face of said die to resist acrushingpressure therefrom, and non-rotative sustaining means above theaxis of said die sustaining said pressing means and by which saidpressing means aresustained.

19.'In combination, an annular crushing die revolving in anapproximately vertical plane and having an internal crushing face.tworotatable crushingrolls movable toward and tromk one another withinand eccentric of said die and each having a `peripheral crushing facereciprocal to the internal face of said die, means for revolving one ofsaid parts, movable non-rotative means on which said rolls arerotatablyvmounted respectively, pressing means at the side of said rollsmounted inwardly of the axes of said rolls, intermediate `of andopposite said non-rotative members respectively, and acting through thelatter respectively to press said rolls outwardly away from one anotherto resist a crushing pressure from the inner face of said die, andnon-rotative sustaining means sustaining said pressing means and bywhich said pressing means are sustained.

20. In combination, an annular crushing die revolving in anapproximately vertical plane and having an internal crushing face, arotatable crushing roll within the Lipper part of and eccentric of saiddie, a movable and rotatable crushing roll within the lower part of andeccentric of said die, said. rolls each having a peripheral crushingface reciprocal to theinternal face of said die, means for revolving oneof said parts, upper nonrotativesustaining means on which said upperroll is rotatably mounted, movable non-rotative means on which saidlower roll is rotatably mounted, and pressing means disprosedat the sideof said rolls above the axis ,of said `lower lroll and opposite andmounted above said movable non-rotative means and acting throughtheflatter to press saidlower roll .downwardlytoward the inner face, ofsaidffdie to resista crushing pressure from the Y latter and reactingtoward said upper` non-rotative member.

21. ln combination, an annular kkcrushing die `revolving 1, in yanapproximately .vertical plane and having an internal crushing face,

two movable and rotatable crushing rolls within and eccentric oi" saiddie and each having a peripheralcrushing face reciprocal to the internalface of said die, means for revolving one of said parts, movablenonrotative sustaining means on which said rolls are rotatably mountedrespectively, and holding means at the side of said rolls mountedinwardly of the axes of said rolls and opposite and intermediate of saidnonrotative means and acting on the latter to hold said rolls outwardlyaway from one another to resist a crushing pressure from the inner taceof said die and sustained by and reacting on said non-rotative means totransmit the stress of one thereof to another thereof.

22. In combination, an annular crushing die revolving in anapproximately vertical plane and having an internal crushingA face,three rotatable crushing rolls two movable toward and from one anotherwithin and eccentric of said die and each having a peripheral crushingface reciprocal .to the internal face of said die, means for revolvingone of said parts, non-rotative means on which one or' said rolls isrotatably mounted, movable non-rotative means on which said movablerolls are rotatably mounted respectively, pressing means disposed at theside of said rolls intermediate of the axes of said rolls and mountedintermediate of and above and opposite said movable non-rotative meansrespectively and acting on the latter respectively to press said movablerolls outwardly away from one another toward the inner face of said dieto resist a. crushing pressure therefrom,l and non-rotative sustainingmeans sustaining' said pressing means and on which said pressing meansaresustained.

23. ln combination, an annular crushing die revolving in anapproximately vertical plane,-and having an internal crushing face,three rotatable crushing rolls movable toward and from each other withinand eccentric of said die andeach having a peripheral crushingvfacereciprocal to the internal face of said die, means for revolving one ofsaid parts, movable non-rotative meanson which said rolls are rotatablymounted respectively, holding means disposed opposite and intermediateof said non-rotative means and mounted intermediate of the axesuof saidrolls and acting through ysaid nonrotative meansrespectively to holdsaid'rolls outwardly away from o ne another to resist a crushingpressure from the innervlface ofsaid die, and non-rotative sustainingmeans sustaining said holding means and on which said holding means aresustained.

24. ln combination,aniannular crushing die having an internal crushingface, three rotatable crushingrolls movable ,towardand een ,een .otherWithinfwd eeceetraofsaiid die and each having a lperipheral crushing IGSface reciprocal to the internal face of said die, means for revolvingone of said parts, movable non-rotative sustaining means at the side ofsaid die on which said rolls are rotatably mounted respectively, andmovable thrust means at the side of said rolls mounted intermediate ofthe axes of said rolls, and opposite and intermediate of said movablemeans respectively, and acting against the latter to hold said rollsoutwardly toward the inner :tace of said die to resist a crushingpressure from the latter and sustained by and reacting from one toanother of said movable means to transmit the inward stress of one toanother of said rolls.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

' GEORGE H. FRASER.

Witnesses: u

CHARLES E. DoNNELLY, EDMUND J. FENN.

